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7 Compile the program by selecting Build Solution from the Build menu 8 Run the program by selecting Start Without Debugging from the Debug menu When you run the program, you will see the window shown here

2:

An Overview of C#

42 The value of the integral (a) (b) 2

As the preceding instructions show, compiling short sample programs using the IDE involves a number of steps However, you don t need to create a new project for each example program in this book Instead, you can use the same C# project Just delete the current source file and add the new file Then recompile and run This approach greatly simplifies the process Understand, however, that for real-world applications, each program will use its own project

Once an interface has been defined, one or more classes can implement that interface To implement an interface, the name of the interface is specified after the class name in just the same way that a base class is specified The general form of a class that implements an interface is shown here: class class-name : interface-name { // class-body } The name of the interface being implemented is specified in interface-name When a class implements an interface, the class must implement the entire interface It cannot pick and choose which parts to implement, for example A class can implement more than one interface When a class implements more than one interface, specify each interface in a comma-separated list A class can inherit a base class and also implement one or more interfaces In this case, the name of the base class must come first in the comma-separated list

12:

(c) 0 (d) 1 (e) 1 43 The area between the curves y = sin x and y = cos x over the interval [ /2, 9 /4] is (a) 5 2 1 (b) 4 2 1 (c) 2 5 (d) 5 2 + 1 (e) 2 + 1 44 If 3 f (x) dx = 2 and (a) 4 (b) 5 (c) 5 (d) 4 (e) 2 45 If (a) (b) (c) (d) (e)

The methods that implement an interface must be declared public The reason for this is that methods are implicitly public within an interface, so their implementation must also be public Also, the return type and signature of the implementing method must match exactly the return type and signature specified in the interface definition Here is an example that implements the ISeries interface shown earlier It creates a class called ByTwos, which generates a series of numbers, each two greater than the previous one

// Implement ISeries class ByTwos : ISeries { int start; int val; public ByTwos() { start = 0; val = 0; } public int GetNext() { val += 2; return val; } public void Reset() { val = start; } public void SetStart(int x) { start = x; val = start; } }

I m surprised at how late Easter is this year It s fun to pick apples in October; Tuesday or Wednesday is best because there are fewer people

As you can see, ByTwos implements all three methods defined by ISeries As explained, this is necessary since a class cannot create a partial implementation of an interface Here is a class that demonstrates ByTwos:

// Demonstrate the ISeries interface using System; class SeriesDemo { static void Main() { ByTwos ob = new ByTwos(); for(int i=0; i < 5; i++) ConsoleWriteLine("Next value is " + obGetNext()); ConsoleWriteLine("\nResetting"); obReset(); for(int i=0; i < 5; i++) ConsoleWriteLine("Next value is " + obGetNext());

50 40 48 46 47

Part I:

ConsoleWriteLine("\nStarting at 100"); obSetStart(100); for(int i=0; i < 5; i++) ConsoleWriteLine("Next value is " + obGetNext()); } }

To compile SeriesDemo, you must include the files that contain ISeries, ByTwos, and SeriesDemo in the compilation The compiler will automatically compile all three files to create the final executable For example, if you called these files ISeriescs, ByTwoscs, and SeriesDemocs, then the following command line will compile the program: